<template>
  <div>
     <div>
      <span>全选:</span>
      <input type="checkbox"  v-model="all" />
      <button>反选</button>
      <ul>
        <li v-for="item in arr" :key="item.name">
          <input type="checkbox" v-model="item.checked" />
          <span>{{item.name}}</span>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
data(){
  return{
     arr: [
          {
            name: "猪八戒",
            checked: false,
          },
          {
            name: "孙悟空",
            checked: false,
          },
          {
            name: "唐僧",
            checked: false,
          },
          {
            name: "白龙马",
            checked: false,
          },
        ],
  }
},
computed:{
  all:{
    get(){
      return this.arr.every(item => item.checked);
    },
    set(val){
      this.arr.forEach(item=> item.checked=val)
    }
   
  } ,
}
}
</script>

<style>

</style>